JPH05300544A - Video display device - Google Patents

Abstract

PURPOSE:To enable a bright display through an ordinary liquid crystal panel by showing the images on two liquid crystal display panels with a shift of a single field secured between them by means of a V start signal using the vertical synchronizing signal of a video signal. CONSTITUTION:The input conditions of an AND gate 19 are satisfied and an R-V start signal 20a is generated as long as a digital signal (E/O signal) 16a and a pulse signal (VD signal) 18a are identical with the positive signals of the same level. The signal 20a is inputted to a liquid crystal display panel 22R. Meanwhile the input conditions of an AND gate 21 are satisfied and an L-V start signal 21a is generated as long as the signal obtained from the signal 16a via an NOR gate 20 and the signal 18a are identical with the positive signals of the same level. The signal 20a is generated at the time of an EVEN field, and the signal 21a is generated at the time of an ODD field respectively. Thus the liquid crystal display panels 22L and 22R are alternately reset synchronously with a vertical synchronizing signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image display device which prevents flicker.

[0002]

2. Description of the Related Art As a prior art of a stereoscopic image display device of this type, there is the invention of Japanese Patent Application No. 3-256836 of the same applicant. The content of the present invention relates to a liquid crystal display panel provided with a light terminal for writing an image signal to a liquid crystal display panel corresponding to the left and right eyes and a hold terminal (hereinafter referred to as W / H terminal) for holding a memory effect, It becomes possible to obtain a flicker-free stereoscopic image by creating a switching signal synchronized with the vertical synchronizing signal and alternately displaying the previous image on the left and right liquid crystal display panels by the switching signal. There is.

[0003]

However, the stereoscopic image using the liquid crystal display panel in the prior art requires the use of a liquid crystal display panel having a W / H terminal. It cannot be applied to a general liquid crystal display panel having no terminals.

Therefore, even a liquid crystal display panel having no W / H terminal has a problem in a structure capable of obtaining a stereoscopic image without flicker.

[0005]

As a concrete means for solving the above-mentioned problems of the prior art, the present invention arranges two liquid crystal display panels at a position visible only by the left eye and at a position visible only by the right eye. , A video display device that separately displays stereoscopic image signals corresponding to the left and right eyes for each field of the video signal on the liquid crystal display panels arranged for the left eye and the right eye, respectively. An image display device, characterized in that, immediately before the stereoscopic image signal corresponding to the image viewed by the eye comes, a V start signal synchronized with a vertical synchronizing signal is alternately applied to the liquid crystal display panels to refresh the image. In addition, the image display device is characterized in that it is in the shape of glasses.

[0006]

According to the present invention, the left and right liquid crystal display panels are sequentially erased by the V start signal synchronized with the vertical synchronizing signal, whereby the liquid crystal display panel is not provided with a separate W / H terminal. Even in this case, a stereoscopic image without flicker can be obtained.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the illustrated embodiments. As shown in FIG. 1, a video display device 1 includes a half mirror in a portion corresponding to a lens of an eyepiece of an eyeglass-shaped device body 2. Alternatively, the blindfold panel 3 made of colored glass is attached, the pair of handles 4 is provided with earphones 5L and 5R, and the cord 6 serving as a video signal, an audio signal and a power supply is taken out from one end of the apparatus body 2. It is a composition.

Although not shown in the drawing, a predetermined circuit is incorporated in the handle 4, and a part of one handle 4 is provided with an operation button group 7 for performing operations such as reproduction, fast forward, stop and pause. Equipped.

FIG. 2 is a view of the image display device 1 seen from the back side, and a frame 8 having eyepieces 8L and 8R corresponding to the left and right eyes, and a frame 8 surrounding the frame 8 are attached to the device main body 2. And the back panel 9 that is formed. The back panel 9 is provided with viewing windows 10L and 10R for viewing the outside world by removing the eyes from the eyepieces 8L and 8R.

Although not shown, two liquid crystal display panels (not shown) are mounted inside the apparatus main body 2, and a mirror or the like formed in a mountain shape is incorporated between the liquid crystal panels to obtain a stereoscopic image. ing. A circuit for alternately displaying the images of the two liquid crystal display panels for each field to obtain a stereoscopic image, that is, a V signal control unit 11 is incorporated.

As shown in FIG. 3, the V signal control unit 11 outputs the video signal 12a input from the input terminal 12 to the R signal.
The video signal 13a, which is amplified by the GB drive amplifier 13 and is composed of the RGB components, is input to the driver 14.

The stereoscopic video signal 14a obtained by the driver 14 is sent to the two liquid crystal display panels 22R and 22L to be imaged.

On the other hand, the amplified video signal is passed through an LPF 15 which is a filter which passes only a certain frequency or less, and a V sync 15a which is a vertical sync signal and an H sync 15b which is a horizontal sync signal are extracted.

The EVEN / ODD discrimination circuit 16 uses the V
A digital signal (hereinafter referred to as E / O) which is a rectangular wave inverted every one field based on the sync 15a and the H sync 15b.
16a is output to generate an R-V start signal 20a and an L-V start signal 21a described later.

On the other hand, the video signal 13a amplified by the RGB drive amplifier 13 is input to the controller 18, and a pulse signal (hereinafter referred to as VD signal) for each field based on the vertical synchronizing signal included in the video signal 13a.
18a to generate two liquid crystal display panels 22R, 22
This is one condition for resetting the L image.

If the E / O signal 16a and the VD signal 18a are positive signals of the same level, the R-V start signal 20a is generated when the input condition of the AND gate 19 is satisfied, and is input to the liquid crystal display panel 22R. It

The image on the liquid crystal display panel 22R is reset by the R-V start signal 20a, and a new stereoscopic image signal 14a can be input to the liquid crystal display panel 22R to display the image.

The LV start signal 21a is the same as the signal obtained by the E / O signal 16a via the NOR gate 20 and VD.
If the signal 18a is a positive signal having the same level, the AND gate 21 satisfies the input condition and is input to the liquid crystal display panel 22L.

The image on the liquid crystal display panel 22L is reset by the LV start signal 21a, and a new stereoscopic image signal 14a can be input to the liquid crystal display panel 22L to display the image.

As described above, the R-V start signal 2
0a is generated when the field is EVEN, and the LV start signal 21a is a signal generated when the field is ODD, so that the liquid crystal display panels 22L and 22R can be reset alternately in synchronization with the vertical synchronization signal. ..
That is, the liquid crystal display panel 22 is controlled by the video signal 12a.
Since the images displayed on L and 22R can be alternately refreshed and displayed, a stereoscopic image without flicker can be obtained.

Next, in synchronization with the above-described vertical synchronizing signal, R of field EVEN / ODD alternately generated.
-V start signal 20a and LV start signal 21a
The relationship will be described with reference to the timing chart diagram shown in FIG.

The E / O signal 16a is a digital signal which is inverted by each field by the video signal 12a.
In the case of EVEN it forms a positive signal and in the case of ODD it forms a negative signal.

The R-V start signal 20a is a signal generated by the E / O signal 16a and the VD signal 18a. When the E / O signal 16a and the VD signal 18a are positive signals, the R-V start signal 20a is generated. The start signal 20a is generated as a positive signal.

The LV start signal 21a is a signal generated by the E / O signal 16a and the VD signal 18a, is a negative signal of the E / O signal 16a, and is the VD signal 18a.
When a is a positive signal, the LV start signal 21a is generated as a positive signal.

The R-V start signal 21a and the L-V start signal 20a thus generated are alternately generated for each field, and the liquid crystal display panels 22L, 22R are alternately reset, and a new one is generated each time. Stereoscopic video signal 14a
The image can be displayed.

That is, the intervals at which the two signals 20a, 21a are generated are shifted by exactly one field, and the intervals (A, B) correspond to the intervals of one frame of the video signal 12a.

In this way, the left and right liquid crystal display panels can be refreshed by shifting by one field, which has exactly the same function as the control by the W / H terminal having a memory effect, and is stereoscopic. You will be able to get a video.

[0028]

As described above, the image display apparatus of the present invention displays an image having a shift of one field on two liquid crystal display panels by the V start signal using the vertical synchronizing signal of the video signal. It is possible to realize a stereoscopic image by reducing the circuit that rewrites the image on the liquid crystal display panel, and it is not necessary to provide a separate terminal for refreshing the liquid crystal display panel. Therefore, it is common to use a specified liquid crystal display panel. It has an excellent effect that a clear display can be performed with a conventional liquid crystal panel.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire eyeglass-type image display device according to the present invention.

FIG. 2 is a perspective view of the image display device shown in FIG. 1 as viewed from the back side.

FIG. 3 is a block diagram showing a circuit for obtaining a stereoscopic image based on a video signal according to the present invention.

FIG. 4 is a timing chart of each signal generated in synchronization with the vertical synchronizing signal in the block diagram shown in FIG.

[Explanation of symbols]

 1 Image Display Device 2 Device Main Body 3 Blindfold Panel 4 Handle 5L, 5R Earphone 6 Code 7 Operation Button Group 8 Frame 8L, 8R Eyepiece 9 Back Panel 10L, 10R Viewing Window 11 V Signal Control Unit 12 Input Terminal 12a Video Signal 13 RGB drive amplifier 13a Video signal 14 Driver 14a Stereoscopic video signal 15 LPF 15a V sink 15b H sink 16 EVEN / ODD discrimination circuit 16a E / O signal 18 Controller 18a VD signal 19, 21 AND gate 20 NOR gate 20a R-V start signal 21a LV start signal 22 NOR gate 22R, 22L liquid crystal display panel

Claims (2)

[Claims] 1. Two liquid crystal display panels are arranged at a position visible only by the left eye and at a position visible only by the right eye, and stereoscopic image signals corresponding to the left and right eyes are provided for each field of a video signal. An image display device which separately displays images on liquid crystal display panels arranged for the left eye and the right eye, and refreshes the image immediately before the stereoscopic image signal corresponding to an image viewed by the left and right eyes comes for each field. Therefore, a V start signal synchronized with a vertical synchronizing signal is alternately applied to both the liquid crystal display panels. 2. The image display device according to claim 1, wherein the image display device has a spectacles shape.